PPSC Physics Chapter 6 Electricity and Magnetism With Answers

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PPSC Physics Chapter 6 Electricity and Magnetism

Sr. # Questions Answers Choice
1 What for is a modulator circuit used. To eliminate carrier waves To superpose the radio frequency signal on the carrier waves To transmit the signal To create sound waves
2 The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into. sound wave Electric fluctuations Magnetic fluctuations Signals
3 When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit. Increase Decrease Remain unchanged First decrease and then increases
4 In L - C parallel circuit the coil draws a. Lagging current Leading current Lagging voltage Leading voltage
5 In a parallel resonant circuit, at resonance Current is maximum Voltage is maximum Impedance is minimum Impedance is zero
6 In a series resonant circuit, the current at resonance is. Maximum Minimum Zero Sometimes maximum and sometimes minimum
7 In L-C parallel circuit the capacitor draws a Lagging current Leading current Lagging voltage Leading voltage
8 The rms value of emf in a circuit is given by a factor of. 0.637 0.7 0.707 1.11
9 The impedance of the circuit at resonance frequency is Minimum Maximum Zero Infinity
10 Susceptance of a circuit is the reciprocal of. Admittance Resistance Reactance Impedance
11 The circuit in which current and voltage are in phase the power factor is. Zero Unity Double 4 times
12 In a purely inductive circuit, the current Lags behind the emf by 90<sup>o</sup> Leads the emf by 90 <sup>o</sup> Is in phase with emf May lag or lead the emf
13 When Xc = Xl, this condition is called. Equality Balanced Resonance Equlibrium
14 The effective resistance offered by the resistance capacitance and inductance in an A.C. circuit is known as Impedance Resistance Capacitance <div>Reactance</div>
15 In a R-L-C series circuit, when the frequency of A.C. source is high the circuit is. R-L Circuit R-C circuit L-C circuit R-L or R-C
16 In the equation P = IV cos Theta Cos theta is known as Phase angle Liming angle Phase Power factor
17 The power dissipation in a pure inductive or capacitive circuit is. Maximum Minimum Zero Infinity
18 In any L-C-R circuit Current lags the applied voltage Current leads the applied voltage Current sometimes leads and sometimes lags the applied voltage Current remains in phase with voltage
19 The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called. Reluctance Impedance Reactance Resistance
20 The combined effect of resistance and reactance's in A.C. circuit is called. Resistance Conductance Choke Impedance
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